diff --git a/passerelle/apps/atos_genesys/models.py b/passerelle/apps/atos_genesys/models.py
index b93eb98c..5b4f0ae8 100644
--- a/passerelle/apps/atos_genesys/models.py
+++ b/passerelle/apps/atos_genesys/models.py
@@ -335,7 +335,7 @@ class Resource(BaseResource, HTTPResource):
     def cherche_beneficiaire_url(self):
         return urlparse.urljoin(self.base_url, 'WSUsagerPublik/services/PublikService/chercheBeneficiaire')
 
-    def call_cherche_beneficiaire(self, nom, prenom, dob):
+    def call_cherche_beneficiaire(self, prenom, nom, dob):
         rows = self.xml_request_multiple(self.cherche_beneficiaire_url, params={
             'nmPer': nom,
             'prPer': prenom,
@@ -366,7 +366,10 @@ class Resource(BaseResource, HTTPResource):
             date_of_birth = datetime.datetime.strptime(date_of_birth, '%Y-%m-%d')
         except (ValueError, TypeError):
             raise APIError('invalid date_of_birth: %r' % date_of_birth)
-        beneficiaires = self.call_cherche_beneficiaire(first_name, last_name, date_of_birth)
+        beneficiaires = self.call_cherche_beneficiaire(
+            prenom=first_name,
+            nom=last_name,
+            dob=date_of_birth)
         for beneficiaire in beneficiaires:
             ref_per = beneficiaire.get('REF_PER')
             if not ref_per: